I have a wine bottle mold and have been making cheese/spoon trays. I have a more than occasional problem of the bottle having spikes/points along the edges like it sticks to the mold. I use kiln wash after every 2 – 3 firings. I have tried a hotter cycle, and tried firing with the preprogramed fuse mode on my kiln for 90 and 96 glass. What could this be from and how do I fix??????